FR2777642A1 - DOOR FOR HEATING CABINET - Google Patents

Abstract

Door for a heated cabinet comprising an outer door (30) whose edge (34) is bent at a right angle inwards, to form a frame which goes all the way around, and an inner door (10) made of sheet metal inserted into the frame of the outer door (30). The outer edge of the inner door is separated from the frame of the outer door (30) by a peripheral separation seal (18). Supports (22) of the inner door (10) are connected to the frame (34, 36, 38) of the outer door (30) and support the inner door in the outer door. The brackets (20) are tabs integrally formed from the sheet metal of the inner door (10) which engage with stampings (40) of the outer door (30).

Description

State of the art The invention relates to a cabinet door

  heated with an exterior door that has a sheet metal door panel, the edge of which is folded in at right angles to the inside, to form a frame that goes around,

  frame-shaped, with an inner sheet metal door which is in-

  in the frame of the exterior door, the outside edge

  interior door laugher being placed at a certain distance from the exterior door frame by a separation joint which goes all around, and with interior door supports which connect the interior door to the exterior door frame and support the inner door in

the outer door.

  Heated cupboards, especially ar-

  heated memory cabinets for laboratories have a space

  interior, which can be heated to high temperatures. It is possible to operate, for example, drying cabinets at temperatures up to 300 C. The thermal insulation of the door of these devices is above all what creates in this case difficulties. While the inside of the

  door takes the high temperature from inside the ar-

  moire, for example up to 300 C, the outside

  the door should be kept as cold as possible, preferably

below 50 C.

  In the case of known heating cabinets, the door therefore consists of an external door, which for example is made of galvanized sheet steel, coated with

  powder, and in an interior door, which is made of pre-

  ference in a special steel sheet. The exterior door and

  the interior door are thermally separated very ample-

  and for this the heat conducting contacts between the interior door and the exterior door are also maintained

small as possible.

  In the case of a heating cabinet, known from document DE-41 18 800-C3, of the type mentioned at the start, the outer door is therefore folded at right angles around its outer circumference to form a frame which goes all around, in the form of a frame. We insert into this chassis the

  inner door in such a way that between the outer edge

  the inner door and the outer door frame

  a line of joint, going all around, remains free.

  It is only in the four corners that the door

  is connected and held by door supports

  interior with the exterior door frame. These sup-

  inner door ports form the only conduc-

  heat between the interior door and the exterior door. Due to the small cross section of these supports of the interior door, this produces a very weak heat conductive contact between the door.

  interior and exterior door.

  In the case of this known door, the supports of the interior door consist of metal tabs,

  which are screwed or welded on the one hand to the interior door

  on the other hand on the exterior door. The screwing or

  welding the metal legs constitutes a sequence of work

  additional value when manufacturing the heated cabinet. The object of the invention is to improve a heating cabinet of the type mentioned at the start so that its manufacture becomes more economical while retaining or

  improving its good properties.

  This problem is solved by a door whose supports of the interior door are lugs formed integrally from the sheet of the interior door or the exterior door, lugs which engage in

  stamping of the exterior door or the interior door.

  The essential idea of the invention consists in not manufacturing the supports of the interior door in the form of spare parts, but in forming them in one piece in the form of lugs when stamping the sheet metal for the

  interior door or for the exterior door. During the

  crimping the interior door into the chassis of the exterior door these tabs engage in stampings

  door counter correspondents, that is to say in ma-

  exterior door trims, as long as the legs

  are formed on the interior door. In this way we sim-

  significantly reduces the manufacturing of the door, because the pat-

  your and the moldings formed to receive these legs can

  be carried out in the same work phase during the estam-

  page of sheets for the interior door and the exterior door. There is no need to have an additional sequence

  work tool for manufacturing the door supports

  later. In the same way we do without work sequence

  additional for fixing the door supports

  on the interior door and on the exterior door.

  In addition to these considerable cost reductions

  manufacturing, we also get an improvement in the separation

  thermal ration of the interior door and the exterior door

  better. The legs of the supports of the interior door, which

  have only the thickness of the sheet, are supported in the ma-

  doorway trims, e.g. outside door

  only with their thin sheet metal edges, without bonding by welding or screwing. We reduce this

  again the thermally conductive contact between the interior door

the exterior door.

  To allow particularly simple mounting

  ple, the legs are preferably formed on the interior door

  better. The legs have a protruding stud and a spacer support edge. The tabs of one of the lateral edges of the interior door are inserted with the nipple into the nipple holes of the chassis of the exterior door, so that the interior door is fixed to this lateral edge as well perpendicularly to the plane of the door as also in the plane of the door. The support edge

  in this case the interior door keeps at

  tance of the exterior door frame, to achieve the

  joint seal. On the opposite edge, the stampings are formed in the form of closing slots, so that the interior door can pivot within the frame of the frame of the exterior door, the lugs of the tabs then entering these closing slots. It is then no longer necessary to have a simple blocking piece to fix the legs.

  in the closing slots and to prevent the door from

  greater than falling and exiting the exterior door frame

  better. For this blocking piece you can use a simple

  ple interior door blocking piece formed in the form of a stamped sheet metal strip which is fixed with a single screw. To mount the door, all you have to do is insert the pins of the supports on one of the side edges of the interior door into the corresponding holes for nipples on the chassis, pivot the interior door in the exterior door and to fix the pins having pivoted by means of the blocking piece of the interior door and to firmly screw the two locking pieces of the interior door

with one screw respectively.

  Preferably the tabs of the interior blocking piece are formed on the lateral outer border bands folded at right angles to the interior door, which has a favorable effect on the stability of the door.

  inside and on its fixing in the outside door.

  According to other characteristics of the invention: * the supports of the interior door are formed on the interior door and engage in stampings of the chassis of the exterior door,

  * the interior door has exterior strips of

  hard, folded at right angles to the door panel, and * the interior door supports are formed from these outer border strips, * an interior door support is disposed respectively on each of the four corners of the interior door , * two supports of the interior door leave parallel to each other perpendicularly from a side edge of the interior door, and * the two other supports of the interior door leave perpendicularly from the opposite lateral edge parallel,

  * the supports of the interior door have respective-

  a nipple that engages in the corresponding stamping

  laying of the outer door and a spacer which keeps the inner door at a certain distance from the frame of the outer door, distance which corresponds to the separation joint, ò the spacer is a support edge of spacing, formed on the leg of the support of the interior door which opposes a pushing of the interior door on the frame of the exterior door, a one can insert the supports of a lateral edge of the interior door by their pins in nipple holes which are arranged in an inner edge of the frame of the outer door, and

  * you can rotate the supports of the lateral edges oppo-

  the inner door with the pins in the closing slots which are arranged in the edge of the frame which is located on the side of the cabinet, and in the inner edge of the frame of the outer door, * the supports of the inner door , which can pivot, can be locked by a blocking piece of the interior door in the frame, * the blocking piece of the interior door can be fixed in the frame and keeps the stud of the support

interior door.

  The present invention will be described below

  in more detail from an exemplary embodiment shown

  tee on the accompanying drawings in which:

  * Figure 1 shows a perspective view of the interior door

laughing,

  * figure 2 shows the constitution of the sheet metal part

  buffered for the manufacture of the interior door,

  * Figure 3 shows a perspective view of the exterior door

  lower, * Figure 4 shows in detail the construction of the closing slit of the outer door, * Figure 5 shows a perspective view of the fixing of the inner door and * Figure 6 shows a vertical section through the door

  assembled along section line A-A in Figure 3.

  A heated cabinet, in particular an ar-

  laboratory heating moire is constructed in a way

  known per se, and does not constitute the subject of the invention.

  The corresponding heating cabinet is not shown on

  the drawings and will not be described below. The invent-

  tion concerns only the door of the heating cabinet.

  The door of the heating cabinet consists of an interior door 10 shown in Figure 1 and an exterior door 30 shown in Figure 3. The interior door 10 is made of sheet steel, stamping all first a piece of sheet metal

  in one piece, as shown in Figure 2.

  This sheet metal part is folded so as to form a flat door panel 12 which closes the open side of the heating cabinet. On the four lateral edges of the door panel 12, an outer border strip 14 is folded at right angles, the outer edge of which is again folded at right angles to form another internal border strip 16 which extends in this way to its turn parallel to the plane of the door panel 12. The U-shaped profile which is formed by the door panel 12, the outer border strips 14 and the internal border strips 16, serves in a way

  known to receive a heat insulating material.

  On the two outer border strips 14, which extend vertically, an interior door support 20 is formed in one piece at the top and bottom, by stamping the sheet metal part. The door supports 20 are formed in the form of legs which extend towards the

  up or down in the plane of the outer side bands

  border rieures 14. The tabs have a tenon 22 which projects vertically upwards or downwards, tenon to which a spacer support edge 24 is connected.

  spacer support 24 extends parallel to the strip

  outer or lower edge border 14 of the door

  inner 10 and is arranged relative to this upper strip

  lower or lower border 14 at a certain distance,

  which defines in a way that will be described later the

  geur of a joint line 18 between the interior door 10 and

the outer door 30.

  The outer door 30 which is shown in Figure 3, is also stamped and folded in one piece from a sheet of steel. The outer door 30 has a door panel 32 which has more lateral dimensions

  larger than the door panel 12 of the interior door 10.

  On the surface of the outer door 30 which is located on the side of the cabinet, a frame has been formed which goes around. To do this, we first folded a right angle

  outer edge of the frame 34 on the outer edges of the pan

  neau 32 of the outer door 30. Its outer edge is in turn folded at right angles inward to form a frame edge 36, located on the side of the cabinet, and finally

  its edge is once again folded at right angles towards the

  térieur to form an inner edge of frame 38 which in this way again extends perpendicular to the plane

  door panel 32. Door panel 32, the outer edge

  frame of the frame 34, the edge of the frame 36 which is located on the side of the cabinet and the inner edge 38 of the frame thus form a four-sided profile which forms a frame

  going around the perimeter of the door panel 32.

  The internal dimensions of this frame are slightly larger than the external dimensions of the internal door

  10, so that when the interior door is inserted

  10 in the frame of the exterior door 30 the seal

  partition 18 remains free between the inner edge of the frame

  sis 38 of the outer door 30 and the outer strip of

  border 14 of the interior door 10.

  When stamping the sheet metal part of the outer door 30, a nipple hole is made by stamping in the inner edge 38 of the chassis of the lower edge of

  the outer door 30 respectively in the two angles.

  The nipple holes 40 are arranged in such a way that they are respectively at a certain lateral distance after the chassis has been folded from the inner edge of the chassis 38 which extends vertically in succession, a distance which corresponds to the width of the joint separation 18 When stamping the sheet metal part of the outer door 30, two other stamping operations are carried out

  closing slots 50 in the area which is folded over

  port at the edge of the chassis 36, located on the side of the cabinet and by

  relative to the inner edge of the chassis 38 from the upper side edge

  laughter of the exterior door 30. As can be seen in the

  Figure 3 and in particular in Figure 4, the iron slots-

  measure 15 extend perpendicular to the folding edge which connects the edge of the frame 36 which is located on the side of the cabinet, to the inner edge of the frame 38. In this case an inner section 52 of the closing slots 50 s' extends in

  the inner edge of the frame 38, while an outer section

  rieure 54 extends in the edge of the chassis 36 which is located

  side of the cabinet. Roughly in the middle of this section ex-

  54, in addition, a transverse slot 56 has been produced by stamping which extends perpendicular to the closing slot 50, that is to say parallel to the folding edge.

  and which extends symmetrically with respect to the iron slot-

  measurement 50. Finally, stamping is carried out in the pro-

  along the axial length of the outer section 54 of the closing slots 50 respectively a threaded hole 58 in the face of the edge of the frame 36 which is located on the side of the cabinet. The closing slots 50 are respectively arranged such that they are located after the folding of the frame of the outer door 30 at a certain lateral distance from the edge.

  inside of the chassis 38 which is connected vertically respectively

  setting, distance which corresponds to the width of the separation joint 18 When assembling the door, insert the

  inner door 10, shown in Figure 1, in the chassis

  located on the outer door 30. To do this, first insert the pins 22 of the supports 20 of the inner door on the lower side of the inner door 10 into the holes for nipples 40 on the lower side of the outer door 30. The width nipples 22 in the direction perpendicular to the plane

  in this case corresponds to the diameter of the nipple holes 40.

  The nipples 22 are in this way held in the holes

  for nipples 40 as well against perpendicular sliding-

  in the plane of the door that also against a slide-

  lateral in the plane of the door. During the insertion of the pins 22 into the holes for pins 40 the spacing support edges 24 of the lower supports 20 rest on the inner edge of the frame 38 on the lower side of the outer door 30. In this way the lower strip outer 14 of the inner door 10 is kept at a distance from the inner edge of the frame 38 on the lower side of the door

  outer 30 which corresponds to the width of the separating joint

  tion 18. By this arrangement of tenon holes 40, the distance between the outer vertical border strips 14 of the inner door 10 and the

  interior vertical edges of frame 38 of the exterior door

  lower 30 and this distance is fixed so that it is equal to the width of the separation joint 18. Finally the distance of the pins 22 relative to the plane of the panel 12

  of the inner door 10 and the distance of the holes for

  tones 40 relative to the plane of the edge of the chassis 36 which is so-

  killed on the side of the cabinet of the exterior door 30 are determined so that after the insertion of the interior door 10 in the frame of the exterior door 30 the panel 12 of the interior door 10 is in the plane of the edge of the chassis 36 which is located on the side of the cabinet,

the outer door 30.

  After inserting the nipples 22 from the lower edge of the interior door 10 into the nipple holes 40

  rotates the inner door 10 by its upper edge.

  in the frame of the outer door 30, as shown

  indicated by a double arrow in figure 6. In doing so the

  tones 22 of the supports 20 of the interior door pass on the

  upper edge of the inner door 10 through the sec-

  inner portions 54 of the closing slots 50 and arrive in the interior sections 52 of these closing slots

  50. The pins 22 come into abutment on the inner end

  interior sections 52. The support edges of the

  24 of the supports 20 of the interior door rest on the upper inner edge of the frame 38, so that even between the upper inner edge of the frame 38 of the

  outer door 30 and the upper outer strip of bor-

  lasts 14 from the interior door 10 the separating joint is formed

  ration 18 of the predefined width.

  In order to lock the pins 22 in the closing slots 50, and to prevent the interior door from tipping out of the chassis of the exterior door, interior door locking pieces are provided.

  one of which is shown in Figure 5. The interior parts

  locking blocks 60 consist of a sheet metal strip, which is folded at right angles at one end with respect to a locking section 62. The width of the locking piece

  interior 60 corresponds to the width of the transverse slot

  dirty 56. In the folded locking section 62, the

  made by stamping a nipple hole 64, the diameter of which

  corresponds to the width of the nipple 22. We produced by estam-

  page adjacent to the folding edge a notch 66 in the locking section 62, so that the width of the locking section 62 is reduced in the

  area of this notch 66 to the width of the closing slot

  ture 50. Finally we made another hole by stamping

  for a screw 68 at the end of the internal locking piece

  lower 60, opposite the locking section 62.

  To lock the interior door 10 in the frame of the exterior door 30, the

  blocking of the interior door 60 by its section of glass

  rusting 62 through the transverse slot 56 in the edge of the frame 36 which is located on the side of the cabinet. As soon as the fixing piece 60 lies flat on the inner edge of the frame 38, the inner locking piece 60 can be pushed down, the locking section 62 coming with its

  notch 66 in the outer section 54 of the iron slot

  method 50. In doing so, the nipple hole 64 of the locking section 62 moves on the nipple 22 of the support 20 of the interior door. If the inner locking piece 60 is

  completely pushed down so that the sec-

  latch 62 rests internally on the in-

  frame 38, the locking section 62 is then fixed by the notch 66 in the edge of the frame 36 which is located on the side of the cabinet and the hole for nipple 64 fixes the nipple 22. In this position the hole for screw 68 of the interior blocking part 60 overlaps with the threaded hole 58 on the edge of the frame 36, which is located on the side of the cabinet and the internal blocking part 60 is fixed by means of a sheet metal screw 70 which passes through the hole of

  screw 68 and which screws into the threaded hole 58.

  The contact, conductor of heat, between the interior door 10 and the exterior door 30 is limited to the minimum area of the surface, on which the supports 20 of the interior door rest by the narrow edges of the studs 22 and the edges of spacing support 24 on the inner edge of the frame 38. There is no need to weld or screw the supports 20 of the inner door with the inner edge 38

of the chassis.

  If necessary, it can be inserted in the door

  10 and in the outer door 30 a window of a

in a manner known per se.

NOMENCLATURE OF REFERENCES

  Inner door 12 Door panel 14 Outer edge strip 16 Inner edge strip 18 Separation joint Inner door support 22 Stud 24 Spacer support edge Outer door 32 Door panel 34 Outer frame edge 36 Chassis edge located on the side of the cabinet 38 Inner edge of the frame Nipple hole Closing slot 52 Inner section (in 38) 54 Outer section (in 36) 56 Cross slot 58 Threaded hole Inner door locking piece 62 Locking section 64 Nipple hole 66 Notch 68 Screw hole Screw

R E V E N DI C A T I ON S

  1) Door for a heated cabinet, with an exterior door, which has a sheet metal door panel, the edge of which is folded in at right angles inwards, to form a frame which goes all around, in the form of a frame, with an inner sheet metal door which is inserted into the frame of the outer door, the outer edge of the inner door being placed at a certain distance from the frame of the outer door (30) by a separation joint (18) which makes all around,

  and with supports (22) of the interior door (10) which

  connect the interior door (10) to the frame (34, 36, 38) of the exterior door (30) and support the interior door in the exterior door, characterized in that

  the supports (20) of the interior door are shaped tabs

  mounted in one piece from the sheet of the interior door

  upper (10) or outer door (30), legs which engage in stampings (40, 50) of the door

  exterior (30) or interior door (10).

  2) Door according to claim 1, characterized in that the supports of the interior door (20) are formed on the

  interior door (10) and engage in stampings

  ges (40, 50) of the frame (34, 36, 38) of the outer door (30). 3) Door according to claim 2, characterized in that * the interior door (10) has external border strips (14), folded at right angles to the door panel (12), and

  * the supports of the interior door (20) are formed from

  shot of these outer border strips (14).

  4) Door according to claim 2 or 3, characterized in that

  an interior door support (20) is disposed respectively-

  on each of the four corners of the interior door (10). 50) Door according to claim 4, characterized in that

  * two supports (20) of the interior door leave parallel-

  one to the other perpendicularly from a lateral edge of the interior door (10), and

  * the two other supports (20) of the interior door by

  try perpendicularly from the opposite parallel side edge.

  6) Door according to one of claims 2 to 5,

characterized in that

  the supports (20) of the interior door have respective

  a stud (22) which engages in the stamping cor-

  corresponding (40, 50) of the outer door (30), and a spacer (24) which keeps the inner door at a certain distance from the frame of the outer door (30),

  distance which corresponds to the separation joint (18).

  7) Door according to claim 6, characterized in that the spacer element is a spacer support edge (24), formed on the tab of the support (20) of the inner door which opposes a push of the interior door (10) on the

  frame (38) of the outer door (30).

  8) Door according to one of claims 5 to 7,

  characterized in that * the supports (20) of a lateral edge of the interior door (10) can be inserted by their pins (22) in holes for pins (40) which are arranged in an interior edge of the frame ( 38) of the outer door (30), and e the supports (20) can be pivoted from the opposite lateral edges of the inner door (10) with the pins (22) in closing slots (50) which are arranged in the edge of the frame (36) which is located on the side of the cabinet, and in the inner edge (38) of the frame of the outer door

(30).

  9) Door according to claim 8, characterized in that the supports (20) of the interior door which can pivot, can be locked by a locking piece (60) of the

interior door in the chassis.

  10) Door according to claim 9, characterized in that the blocking part (16) of the interior door can be fixed in the frame and maintains the stud (22) of the support

(20) to the interior door.